UR7HCTS2-P840-FG Semtech Corporation, UR7HCTS2-P840-FG Datasheet - Page 7

• Manufacturer Part Number: UR7HCTS2-P840-FG
• Description: High-Performance/ Low Power PS/2 Touch Screen Controller/Digitizer
• Manufacturer: Semtech Corporation

When the
is received, the UR7HCTS2-P840
sets the following default
parameters: Incremental Stream
Mode, 1:1 scaling, report rate of
100 Hz, and disabled. It then
sends AAh to the host followed by
a device ID of 00h.
The Host sends the
Data Stream Command (FEh)
when the host detects an error in
any UR7HCTS2-P840 transmission.
The device then resends the last
output data packet to the Host.
This transmission occurs after a
ScreenCoder
and before the Host enables the
interface allowing the next
ScreenCoder
The
Command (F6h)
device to its condition at power-up.
The
stops the device from transmitting
all reports. However, the mode
does not change; the
ScreenCoder
respond to commands. If the
Disable Command is issued while
the device is transmitting a report,
the UR7HCTS2-P840 immediately
stops the transmission and
disables itself.
Copyright ©1999-2001 Semtech Corporation
DOC7-TS2-P840-DS-106
PS/2 MODE COMMANDS
Set Default Status
Disable Command (F5h)
Reset Command (FFh)
TM
TM
TM
PS2 transmission
PS2 output.
PS2 is still able to
re-initializes the
Resend Last
The
(ECh)
previous mode, and disabled.
The
Command (F0h)
to Prompt Mode. Data values are
then only reported in response to a
Read Report Command (EBh)
If the
(EEh)
ScreenCoder
immediately return any data bytes
except FFh or ECh.
If the ScreenCoder
Incremental Stream Mode, the
Enable Command (F4h)
it to begin data transmission. If the
device is in Prompt Mode, the
Enable Command will only update
the internal status of the
ScreenCoder
The ScreenCoder
respond to the
Rate Command (F3h)
Stream and Prompt Modes but will
only update its internal status if this
command is enacted while the
device is in the Stream Mode.
The UR7HCTS2-P840 responds to
the
(F2h)
7
Read Device Type Command
Reset Echo Mode Command
Set Prompt (Remote) Mode
Set Echo Mode Command
with the device ID of 00h.
is received, the
returns the device to its
TM
TM
Set Sampling
PS2 will
PS2.
TM
sets the device
TM
PS2 will
PS2 is in
in both
will allow
.
The
(EBh)
PS2 for a report. The report occurs
even if the device has not moved
or if the status of the switches did
not change.
The
Mode Command (EAh)
ScreenCoder
Mode and disables the device.
The
(E9h)
report.
The
(E8h)
2:1 Scaling Command (E7h)
enables a coarse/fine tracking
response, and the
Command (E6h)
values of movements to be
transmitted to the Host without any
scaling. Due to Semtech’s
Advanced Motion Algorithm, Set
Resolution and Scaling Commands
are acknowledged and reported as
activated, but their status is
ignored.
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Read Report Command
Set Incremental Stream
Status Request Command
Set Resolution Command
returns a 3-byte status
controls resolution, the
prompts the ScreenCoder
TM
PS2 to Stream
enables the
Set 1:1 Scaling
sets the
Set
TM